Forgotten U.S. Infantry Rifles Of World War I
The Americans used shotguns in WW1. What ammo did they use? Did they use Slugs or Sabot or 'just' buckshot? What were common bullet weights? - Quora
How did lawmen carry their ammo in the late 1800s? - Quora
The Americans used shotguns in WW1. What ammo did they use? Did
America's Prototype 'Trench Guns' Of World War I
Shotguns (World War I)
The Winchester 1897 Trench Gun — How Not to Get Scammed
The Guns That Won – British And American Small Arms Of WW2
Instead of complaining that the USA was using shotguns in WW I, why didn't the Germans just start using them themselves? - Quora
How much ammo did a standard Union soldier in the Civil War carry with them? - Quora
Did concrete piercing shells already exist during WWI? - Quora
Are there any other instances of a combat shotgun being used in
WW1 Weapons: Tanks, Guns, Flamethrowers & More
A Short History of the Semi-Automatic Firearm